| Line 168... |
Line 168... |
Q_ALU_OP <= ALU_ADD;
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Q_ALU_OP <= ALU_ADD;
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Q_WE_D <= "01";
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Q_WE_D <= "01";
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Q_WE_F <= '1';
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Q_WE_F <= '1';
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|
|
when "000100" => -- 0001 00xx xxxx xxxx
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when "000100" => -- 0001 00xx xxxx xxxx
|
|
--
|
|
-- 0001 00rd dddd rrrr - CPSE
|
|
--
|
Q_ALU_OP <= ALU_SUB;
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Q_ALU_OP <= ALU_SUB;
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Q_RD_M <= I_T0;
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if (I_T0 = '0') then -- second cycle.
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if (I_T0 = '0') then -- second cycle.
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Q_PC_OP <= PC_SKIP_Z;
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Q_PC_OP <= PC_SKIP_Z;
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end if;
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end if;
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|
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when "000101" | "000110" =>
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when "000101" | "000110" =>
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| Line 303... |
Line 305... |
if (I_OPC(9) = '0') then -- LDD / POP
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if (I_OPC(9) = '0') then -- LDD / POP
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--
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--
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-- 1001 00-0d dddd 0000 - LDS
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-- 1001 00-0d dddd 0000 - LDS
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-- 1001 00-0d dddd 0001 - LD Rd, Z+
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-- 1001 00-0d dddd 0001 - LD Rd, Z+
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-- 1001 00-0d dddd 0010 - LD Rd, -Z
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-- 1001 00-0d dddd 0010 - LD Rd, -Z
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-- 1001 00-0d dddd 0100 - (ii) LPM Rd, (Z)
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-- 1001 00-0d dddd 0100 - LPM Rd, (Z) (ii)
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-- 1001 00-0d dddd 0101 - (iii) LPM Rd, (Z+)
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-- 1001 00-0d dddd 0101 - LPM Rd, (Z+) (iii)
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-- 1001 00-0d dddd 0110 - ELPM Z --- not mega8
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-- 1001 00-0d dddd 0110 - ELPM Z --- not mega8
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-- 1001 00-0d dddd 0111 - ELPM Z+ --- not mega8
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-- 1001 00-0d dddd 0111 - ELPM Z+ --- not mega8
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-- 1001 00-0d dddd 1001 - LD Rd, Y+
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-- 1001 00-0d dddd 1001 - LD Rd, Y+
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-- 1001 00-0d dddd 1010 - LD Rd, -Y
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-- 1001 00-0d dddd 1010 - LD Rd, -Y
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-- 1001 00-0d dddd 1100 - LD Rd, X
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-- 1001 00-0d dddd 1100 - LD Rd, X
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| Line 364... |
Line 366... |
end case;
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end case;
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end if;
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end if;
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|
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when "100101" => -- 1001 01xx xxxx xxxx
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when "100101" => -- 1001 01xx xxxx xxxx
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if (I_OPC(9) = '0') then -- 1001 010
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if (I_OPC(9) = '0') then -- 1001 010
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if (I_OPC(3) = '0') then -- 1001 010x xxxx 0xxx
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case I_OPC(3 downto 0) is
|
|
when "0000" =>
|
--
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--
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-- 1001 010d dddd 0000 - COM
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-- 1001 010d dddd 0000 - COM Rd
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-- 1001 010d dddd 0001 - NEG
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--
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-- 1001 010d dddd 0010 - SWAP
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Q_ALU_OP <= ALU_COM;
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-- 1001 010d dddd 0011 - INC
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Q_WE_D <= "01";
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-- 1001 010d dddd 0101 - ASR
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Q_WE_F <= '1';
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-- 1001 010d dddd 0110 - LSR
|
|
-- 1001 010d dddd 0111 - ROR
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when "0001" =>
|
--
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--
|
case I_OPC(2 downto 0) is
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-- 1001 010d dddd 0001 - NEG Rd
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when "000" => Q_ALU_OP <= ALU_COM;
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--
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when "001" => Q_ALU_OP <= ALU_NEG;
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Q_ALU_OP <= ALU_NEG;
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when "010" => Q_ALU_OP <= ALU_SWAP;
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Q_WE_D <= "01";
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when "011" => Q_ALU_OP <= ALU_INC;
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Q_WE_F <= '1';
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when "101" => Q_ALU_OP <= ALU_ASR;
|
|
when "110" => Q_ALU_OP <= ALU_LSR;
|
when "0010" =>
|
when "111" => Q_ALU_OP <= ALU_ROR;
|
--
|
when others =>
|
-- 1001 010d dddd 0010 - SWAP Rd
|
end case;
|
--
|
|
Q_ALU_OP <= ALU_SWAP;
|
|
Q_WE_D <= "01";
|
|
Q_WE_F <= '1';
|
|
|
|
when "0011" =>
|
|
--
|
|
-- 1001 010d dddd 0011 - INC Rd
|
|
--
|
|
Q_ALU_OP <= ALU_INC;
|
|
Q_WE_D <= "01";
|
|
Q_WE_F <= '1';
|
|
|
|
when "0101" =>
|
|
--
|
|
-- 1001 010d dddd 0101 - ASR Rd
|
|
--
|
|
Q_ALU_OP <= ALU_ASR;
|
|
Q_WE_D <= "01";
|
|
Q_WE_F <= '1';
|
|
|
|
when "0110" =>
|
|
--
|
|
-- 1001 010d dddd 0110 - LSR Rd
|
|
--
|
|
Q_ALU_OP <= ALU_LSR;
|
Q_WE_D <= "01";
|
Q_WE_D <= "01";
|
Q_WE_F <= '1';
|
Q_WE_F <= '1';
|
else -- 1001 010x xxxx 1xxx
|
|
case I_OPC(2 downto 0) is
|
when "0111" =>
|
when "000" => -- 1001 010x xxxx 1000
|
--
|
|
-- 1001 010d dddd 0111 - ROR Rd
|
|
--
|
|
Q_ALU_OP <= ALU_ROR;
|
|
Q_WE_D <= "01";
|
|
Q_WE_F <= '1';
|
|
|
|
when "1000" => -- 1001 010x xxxx 1000
|
if I_OPC(8) = '0' then -- 1001 0100 xxxx 1000
|
if I_OPC(8) = '0' then -- 1001 0100 xxxx 1000
|
--
|
--
|
-- 1001 0100 0sss 1000 - BSET
|
-- 1001 0100 0sss 1000 - BSET
|
-- 1001 0100 1sss 1000 - BCLR
|
-- 1001 0100 1sss 1000 - BCLR
|
--
|
--
|
| Line 412... |
Line 447... |
-- 1001 0101 1010 1000 - WDR
|
-- 1001 0101 1010 1000 - WDR
|
--
|
--
|
case I_OPC(7 downto 4) is
|
case I_OPC(7 downto 4) is
|
when "0000" => -- RET
|
when "0000" => -- RET
|
Q_AMOD <= AMOD_iiSP;
|
Q_AMOD <= AMOD_iiSP;
|
if (I_T0 = '1') then
|
Q_RD_M <= I_T0;
|
Q_RD_M <= '1';
|
|
else
|
|
Q_PC_OP <= PC_LD_S;
|
|
Q_WE_XYZS <= not I_T0;
|
Q_WE_XYZS <= not I_T0;
|
|
if (I_T0 = '0') then
|
|
Q_PC_OP <= PC_LD_S;
|
end if;
|
end if;
|
|
|
when "0001" => -- RETI
|
when "0001" => -- RETI
|
Q_ALU_OP <= ALU_INTR;
|
Q_ALU_OP <= ALU_INTR;
|
Q_IMM(6) <= '1';
|
Q_IMM(6) <= '1';
|
Q_AMOD <= AMOD_iiSP;
|
Q_AMOD <= AMOD_iiSP;
|
if (I_T0 = '1') then
|
Q_RD_M <= I_T0;
|
Q_RD_M <= '1';
|
|
else
|
|
Q_PC_OP <= PC_LD_S;
|
|
Q_WE_XYZS <= not I_T0;
|
Q_WE_XYZS <= not I_T0;
|
|
if (I_T0 = '0') then
|
|
Q_PC_OP <= PC_LD_S;
|
end if;
|
end if;
|
|
|
when "1000" => -- (i) LPM R0, (Z)
|
when "1100" => -- (i) LPM R0, (Z)
|
Q_DDDDD <= "00000";
|
Q_DDDDD <= "00000";
|
Q_AMOD <= AMOD_Z;
|
Q_AMOD <= AMOD_Z;
|
Q_PMS <= '1';
|
Q_PMS <= '1';
|
Q_WE_D <= '0' & not I_T0;
|
Q_WE_D <= '0' & not I_T0;
|
|
|
when "1110" => -- SPM
|
when "1110" => -- SPM
|
|
Q_ALU_OP <= ALU_D_MV_Q;
|
Q_DDDDD <= "00000";
|
Q_DDDDD <= "00000";
|
Q_AMOD <= AMOD_Z;
|
Q_AMOD <= AMOD_Z;
|
Q_PMS <= '1';
|
Q_PMS <= '1';
|
Q_WE_M <= "01";
|
Q_WE_M <= "01";
|
|
|
when "1111" => -- SPM #2
|
when "1111" => -- SPM #2
|
-- page write: not su[pported
|
-- page write: not supported
|
|
|
when others =>
|
when others =>
|
end case;
|
end case;
|
end if;
|
end if;
|
|
|
when "001" => -- 1001 010x xxxx 1001
|
when "1001" => -- 1001 010x xxxx 1001
|
--
|
--
|
-- 1001 0100 0000 1001 IJMP
|
-- 1001 0100 0000 1001 IJMP
|
-- 1001 0100 0001 1001 EIJMP -- not mega8
|
-- 1001 0100 0001 1001 EIJMP -- not mega8
|
-- 1001 0101 0000 1001 ICALL
|
-- 1001 0101 0000 1001 ICALL
|
-- 1001 0101 0001 1001 EICALL -- not mega8
|
-- 1001 0101 0001 1001 EICALL -- not mega8
|
| Line 464... |
Line 498... |
Q_AMOD <= AMOD_SPdd;
|
Q_AMOD <= AMOD_SPdd;
|
Q_WE_M <= "11";
|
Q_WE_M <= "11";
|
Q_WE_XYZS <= '1';
|
Q_WE_XYZS <= '1';
|
end if;
|
end if;
|
|
|
when "010" => -- 1001 010x xxxx 1010
|
when "1010" => -- 1001 010x xxxx 1010
|
--
|
--
|
-- 1001 010d dddd 1010 - DEC
|
-- 1001 010d dddd 1010 - DEC Rd
|
--
|
--
|
Q_ALU_OP <= ALU_DEC;
|
Q_ALU_OP <= ALU_DEC;
|
Q_WE_D <= "01";
|
Q_WE_D <= "01";
|
Q_WE_F <= '1';
|
Q_WE_F <= '1';
|
|
|
when "011" => -- 1001 010x xxxx 1011
|
when "1011" => -- 1001 010x xxxx 1011
|
--
|
--
|
-- 1001 0100 KKKK 1011 - DES -- not mega8
|
-- 1001 0100 KKKK 1011 - DES -- not mega8
|
--
|
--
|
|
|
when "100" | "101" =>
|
when "1100" | "1101" =>
|
--
|
--
|
-- 1001 010k kkkk 110k - JMP (k = 0 for 16 bit)
|
-- 1001 010k kkkk 110k - JMP (k = 0 for 16 bit)
|
-- kkkk kkkk kkkk kkkk
|
-- kkkk kkkk kkkk kkkk
|
--
|
--
|
Q_PC_OP <= PC_LD_I;
|
Q_PC_OP <= PC_LD_I;
|
|
|
when "110" | "111" => -- 1001 010x xxxx 111x
|
when "1110" | "1111" => -- 1001 010x xxxx 111x
|
--
|
--
|
-- 1001 010k kkkk 111k - CALL (k = 0)
|
-- 1001 010k kkkk 111k - CALL (k = 0)
|
-- kkkk kkkk kkkk kkkk
|
-- kkkk kkkk kkkk kkkk
|
--
|
--
|
Q_ALU_OP <= ALU_PC_2;
|
Q_ALU_OP <= ALU_PC_2;
|
| Line 497... |
Line 531... |
Q_WE_M <= "11"; -- both PC bytes
|
Q_WE_M <= "11"; -- both PC bytes
|
Q_WE_XYZS <= '1';
|
Q_WE_XYZS <= '1';
|
|
|
when others =>
|
when others =>
|
end case;
|
end case;
|
end if;
|
|
else -- 1001 011
|
else -- 1001 011
|
--
|
--
|
-- 1001 0110 KKdd KKKK - ADIW
|
-- 1001 0110 KKdd KKKK - ADIW
|
-- 1001 0111 KKdd KKKK - SBIW
|
-- 1001 0111 KKdd KKKK - SBIW
|
--
|
--
|
